From: Eric Dumazet <edumazet@google.com>
Date: Wed, 13 Apr 2016 22:18:38 +0000 (-0700)
Subject: ss: take care of unknown min_rtt
X-Git-Tag: v4.6.0~27
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d9ba887e9d37b2c5ff012f2abd0776cf93208fba;p=thirdparty%2Fiproute2.git

ss: take care of unknown min_rtt

Kernel sets info->tcpi_min_rtt to ~0U when no RTT sample was ever
taken for the session, thus min_rtt is unknown.

Signed-off-by: Eric Dumazet <edumazet@google.com>
---

diff --git a/misc/ss.c b/misc/ss.c
index 544def3f0..deefc9676 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -2019,7 +2019,8 @@ static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
 		s.segs_out = info->tcpi_segs_out;
 		s.segs_in = info->tcpi_segs_in;
 		s.not_sent = info->tcpi_notsent_bytes;
-		s.min_rtt = (double) info->tcpi_min_rtt / 1000;
+		if (info->tcpi_min_rtt && info->tcpi_min_rtt != ~0U)
+			s.min_rtt = (double) info->tcpi_min_rtt / 1000;
 		tcp_stats_print(&s);
 		free(s.dctcp);
 	}